It's very nice of you to write to me,为什么用of
2个回答

有一个办法可以认定用of还是for

把of或for后的人/物拿出来,然后加上be动词,再加上of或for前的形容词,如果合乎逻辑,就是of;不合逻辑,就用for

如:It is very kind of you to say so.(you are kind)

It is stupid of me to do so.(I am stupid)

It is impossible for me to do so.(I am impossible:不合逻辑)